-12. Up and Down

Task Description

Write a program to read a positive integer $n$, then print a sequence of $2n-1$ integers from 1 to $n$, and then from $n-1$ to 1.

Input Format

There is one line in the input. The first line has the integer $n$.

Output Format

There are $2n-1$ lines in the output, according to the description.

Sample Input

5

Sample Output

1
2
3
4
5
4
3
2
1